Can you suggest any manga that the main character is not some coward or something that hides his feelings, and does what is right and not some cliche stuff. like someone that could hit a girl when its the right thing to do. not some coward that's in some moral code or something

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I approached a kid and asked:

"What is Love?"

The kid answered:

"Hmm,
Love is when a puppy licks your face."

I laughed,
but then he added,

"Even after you left him alone all day."

I don't see how hitting a girl would be the right thing to do in any case, but anyway you can check out Molester man.

Try Historie. The MC is mature, smart and not afraid to take risks.

...real character.

most ppl are cowards
most ppl hide their feelings
the world would not be a very nice place to be in if we were allowed to act and show what we really think and feel all the time
what is right and wrong differs greatly from person to person and culture to culture

you should know that there is a reason why the "coward" MC is so popular to use

well no actually , but there are some mangas that even if the main character's life is threatened by a girl. he can't even protect himself hes just there letting the girl do what she wants, i'm just looking for a manga where he know what to do without feeling afraid or anything

________________
I approached a kid and asked:

"What is Love?"

The kid answered:

"Hmm,
Love is when a puppy licks your face."

I laughed,
but then he added,

"Even after you left him alone all day."

I have to agree with TaoPaiPai to some degree.

Onani Master Kurosawa The best you can get.
Byousoku 5 Centimeter 

.....

Melo Holic The views lead shows at start seems pretty cool and realistic to me.
Death Note The lead is a realistic character in many aspects (not all ofc and the writer did unjustice to his character in the second half of series ~_~ )
Zippy Ziggy The lead being selfish
Again!! More or less

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